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mm/nommu.c
50.7 KB
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/* * linux/mm/nommu.c * * Replacement code for mm functions to support CPU's that don't * have any form of memory management unit (thus no virtual memory). * * See Documentation/nommu-mmap.txt * |
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* Copyright (c) 2004-2008 David Howells <dhowells@redhat.com> |
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* Copyright (c) 2000-2003 David McCullough <davidm@snapgear.com> * Copyright (c) 2000-2001 D Jeff Dionne <jeff@uClinux.org> * Copyright (c) 2002 Greg Ungerer <gerg@snapgear.com> |
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* Copyright (c) 2007-2010 Paul Mundt <lethal@linux-sh.org> |
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*/ |
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#include <linux/export.h> |
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#include <linux/mm.h> #include <linux/mman.h> #include <linux/swap.h> #include <linux/file.h> #include <linux/highmem.h> #include <linux/pagemap.h> #include <linux/slab.h> #include <linux/vmalloc.h> |
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#include <linux/blkdev.h> #include <linux/backing-dev.h> #include <linux/mount.h> #include <linux/personality.h> #include <linux/security.h> #include <linux/syscalls.h> |
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#include <linux/audit.h> |
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#include <asm/uaccess.h> #include <asm/tlb.h> #include <asm/tlbflush.h> |
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#include <asm/mmu_context.h> |
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#include "internal.h" |
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#if 0 #define kenter(FMT, ...) \ printk(KERN_DEBUG "==> %s("FMT") ", __func__, ##__VA_ARGS__) #define kleave(FMT, ...) \ printk(KERN_DEBUG "<== %s()"FMT" ", __func__, ##__VA_ARGS__) #define kdebug(FMT, ...) \ printk(KERN_DEBUG "xxx" FMT"yyy ", ##__VA_ARGS__) #else #define kenter(FMT, ...) \ no_printk(KERN_DEBUG "==> %s("FMT") ", __func__, ##__VA_ARGS__) #define kleave(FMT, ...) \ no_printk(KERN_DEBUG "<== %s()"FMT" ", __func__, ##__VA_ARGS__) #define kdebug(FMT, ...) \ no_printk(KERN_DEBUG FMT" ", ##__VA_ARGS__) #endif |
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void *high_memory; struct page *mem_map; unsigned long max_mapnr; unsigned long num_physpages; |
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unsigned long highest_memmap_pfn; |
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struct percpu_counter vm_committed_as; |
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int sysctl_overcommit_memory = OVERCOMMIT_GUESS; /* heuristic overcommit */ int sysctl_overcommit_ratio = 50; /* default is 50% */ int sysctl_max_map_count = DEFAULT_MAX_MAP_COUNT; |
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int sysctl_nr_trim_pages = CONFIG_NOMMU_INITIAL_TRIM_EXCESS; |
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int heap_stack_gap = 0; |
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atomic_long_t mmap_pages_allocated; |
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|
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EXPORT_SYMBOL(mem_map); |
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EXPORT_SYMBOL(num_physpages); |
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|
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/* list of mapped, potentially shareable regions */ static struct kmem_cache *vm_region_jar; struct rb_root nommu_region_tree = RB_ROOT; DECLARE_RWSEM(nommu_region_sem); |
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|
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const struct vm_operations_struct generic_file_vm_ops = { |
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}; /* |
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* Return the total memory allocated for this pointer, not * just what the caller asked for. * * Doesn't have to be accurate, i.e. may have races. */ unsigned int kobjsize(const void *objp) { struct page *page; |
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/* * If the object we have should not have ksize performed on it, * return size of 0 */ |
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if (!objp || !virt_addr_valid(objp)) |
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return 0; page = virt_to_head_page(objp); |
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/* * If the allocator sets PageSlab, we know the pointer came from * kmalloc(). */ |
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if (PageSlab(page)) return ksize(objp); |
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/* |
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* If it's not a compound page, see if we have a matching VMA * region. This test is intentionally done in reverse order, * so if there's no VMA, we still fall through and hand back * PAGE_SIZE for 0-order pages. */ if (!PageCompound(page)) { struct vm_area_struct *vma; vma = find_vma(current->mm, (unsigned long)objp); if (vma) return vma->vm_end - vma->vm_start; } /* |
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* The ksize() function is only guaranteed to work for pointers |
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* returned by kmalloc(). So handle arbitrary pointers here. |
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*/ |
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return PAGE_SIZE << compound_order(page); |
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} |
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int __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
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unsigned long start, int nr_pages, unsigned int foll_flags, |
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struct page **pages, struct vm_area_struct **vmas, int *retry) |
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{ |
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struct vm_area_struct *vma; |
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unsigned long vm_flags; int i; /* calculate required read or write permissions. |
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* If FOLL_FORCE is set, we only require the "MAY" flags. |
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*/ |
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vm_flags = (foll_flags & FOLL_WRITE) ? (VM_WRITE | VM_MAYWRITE) : (VM_READ | VM_MAYREAD); vm_flags &= (foll_flags & FOLL_FORCE) ? (VM_MAYREAD | VM_MAYWRITE) : (VM_READ | VM_WRITE); |
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|
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for (i = 0; i < nr_pages; i++) { |
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vma = find_vma(mm, start); |
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if (!vma) goto finish_or_fault; /* protect what we can, including chardevs */ |
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if ((vma->vm_flags & (VM_IO | VM_PFNMAP)) || !(vm_flags & vma->vm_flags)) |
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goto finish_or_fault; |
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|
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if (pages) { pages[i] = virt_to_page(start); if (pages[i]) page_cache_get(pages[i]); } if (vmas) |
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vmas[i] = vma; |
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start = (start + PAGE_SIZE) & PAGE_MASK; |
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} |
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return i; finish_or_fault: return i ? : -EFAULT; |
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} |
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|
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/* * get a list of pages in an address range belonging to the specified process * and indicate the VMA that covers each page * - this is potentially dodgy as we may end incrementing the page count of a * slab page or a secondary page from a compound page * - don't permit access to VMAs that don't support it, such as I/O mappings */ int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, |
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unsigned long start, int nr_pages, int write, int force, |
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struct page **pages, struct vm_area_struct **vmas) { int flags = 0; if (write) |
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flags |= FOLL_WRITE; |
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if (force) |
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flags |= FOLL_FORCE; |
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|
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return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas, NULL); |
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} |
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EXPORT_SYMBOL(get_user_pages); |
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/** * follow_pfn - look up PFN at a user virtual address * @vma: memory mapping * @address: user virtual address * @pfn: location to store found PFN * * Only IO mappings and raw PFN mappings are allowed. * * Returns zero and the pfn at @pfn on success, -ve otherwise. */ int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn) { if (!(vma->vm_flags & (VM_IO | VM_PFNMAP))) return -EINVAL; *pfn = address >> PAGE_SHIFT; return 0; } EXPORT_SYMBOL(follow_pfn); |
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DEFINE_RWLOCK(vmlist_lock); struct vm_struct *vmlist; |
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void vfree(const void *addr) |
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{ kfree(addr); } |
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EXPORT_SYMBOL(vfree); |
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|
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void *__vmalloc(unsigned long size, gfp_t gfp_mask, pgprot_t prot) |
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{ /* |
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* You can't specify __GFP_HIGHMEM with kmalloc() since kmalloc() * returns only a logical address. |
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*/ |
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return kmalloc(size, (gfp_mask | __GFP_COMP) & ~__GFP_HIGHMEM); |
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} |
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EXPORT_SYMBOL(__vmalloc); |
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|
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void *vmalloc_user(unsigned long size) { void *ret; ret = __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); if (ret) { struct vm_area_struct *vma; down_write(¤t->mm->mmap_sem); vma = find_vma(current->mm, (unsigned long)ret); if (vma) vma->vm_flags |= VM_USERMAP; up_write(¤t->mm->mmap_sem); } return ret; } EXPORT_SYMBOL(vmalloc_user); |
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struct page *vmalloc_to_page(const void *addr) |
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{ return virt_to_page(addr); } |
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EXPORT_SYMBOL(vmalloc_to_page); |
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|
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unsigned long vmalloc_to_pfn(const void *addr) |
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{ return page_to_pfn(virt_to_page(addr)); } |
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EXPORT_SYMBOL(vmalloc_to_pfn); |
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long vread(char *buf, char *addr, unsigned long count) { memcpy(buf, addr, count); return count; } long vwrite(char *buf, char *addr, unsigned long count) { /* Don't allow overflow */ if ((unsigned long) addr + count < count) count = -(unsigned long) addr; memcpy(addr, buf, count); return(count); } /* * vmalloc - allocate virtually continguos memory * * @size: allocation size * * Allocate enough pages to cover @size from the page level * allocator and map them into continguos kernel virtual space. * |
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* For tight control over page level allocator and protection flags |
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* use __vmalloc() instead. */ void *vmalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL); } |
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EXPORT_SYMBOL(vmalloc); |
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/* * vzalloc - allocate virtually continguos memory with zero fill * * @size: allocation size * * Allocate enough pages to cover @size from the page level * allocator and map them into continguos kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); } EXPORT_SYMBOL(vzalloc); /** * vmalloc_node - allocate memory on a specific node * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ |
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void *vmalloc_node(unsigned long size, int node) { return vmalloc(size); } |
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EXPORT_SYMBOL(vmalloc_node); |
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/** * vzalloc_node - allocate memory on a specific node with zero fill * @size: allocation size * @node: numa node * * Allocate enough pages to cover @size from the page level * allocator and map them into contiguous kernel virtual space. * The memory allocated is set to zero. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vzalloc_node(unsigned long size, int node) { return vzalloc(size); } EXPORT_SYMBOL(vzalloc_node); |
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|
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#ifndef PAGE_KERNEL_EXEC # define PAGE_KERNEL_EXEC PAGE_KERNEL #endif /** * vmalloc_exec - allocate virtually contiguous, executable memory * @size: allocation size * * Kernel-internal function to allocate enough pages to cover @size * the page level allocator and map them into contiguous and * executable kernel virtual space. * * For tight control over page level allocator and protection flags * use __vmalloc() instead. */ void *vmalloc_exec(unsigned long size) { return __vmalloc(size, GFP_KERNEL | __GFP_HIGHMEM, PAGE_KERNEL_EXEC); } |
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/** * vmalloc_32 - allocate virtually contiguous memory (32bit addressable) |
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* @size: allocation size * * Allocate enough 32bit PA addressable pages to cover @size from the * page level allocator and map them into continguos kernel virtual space. */ void *vmalloc_32(unsigned long size) { return __vmalloc(size, GFP_KERNEL, PAGE_KERNEL); } |
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EXPORT_SYMBOL(vmalloc_32); /** * vmalloc_32_user - allocate zeroed virtually contiguous 32bit memory * @size: allocation size * * The resulting memory area is 32bit addressable and zeroed so it can be * mapped to userspace without leaking data. |
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* * VM_USERMAP is set on the corresponding VMA so that subsequent calls to * remap_vmalloc_range() are permissible. |
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*/ void *vmalloc_32_user(unsigned long size) { |
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/* * We'll have to sort out the ZONE_DMA bits for 64-bit, * but for now this can simply use vmalloc_user() directly. */ return vmalloc_user(size); |
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} EXPORT_SYMBOL(vmalloc_32_user); |
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void *vmap(struct page **pages, unsigned int count, unsigned long flags, pgprot_t prot) { BUG(); return NULL; } |
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EXPORT_SYMBOL(vmap); |
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|
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void vunmap(const void *addr) |
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{ BUG(); } |
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EXPORT_SYMBOL(vunmap); |
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void *vm_map_ram(struct page **pages, unsigned int count, int node, pgprot_t prot) { BUG(); return NULL; } EXPORT_SYMBOL(vm_map_ram); void vm_unmap_ram(const void *mem, unsigned int count) { BUG(); } EXPORT_SYMBOL(vm_unmap_ram); void vm_unmap_aliases(void) { } EXPORT_SYMBOL_GPL(vm_unmap_aliases); |
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/* |
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* Implement a stub for vmalloc_sync_all() if the architecture chose not to * have one. */ void __attribute__((weak)) vmalloc_sync_all(void) { } |
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/** * alloc_vm_area - allocate a range of kernel address space * @size: size of the area * * Returns: NULL on failure, vm_struct on success * * This function reserves a range of kernel address space, and * allocates pagetables to map that range. No actual mappings * are created. If the kernel address space is not shared * between processes, it syncs the pagetable across all * processes. */ struct vm_struct *alloc_vm_area(size_t size) { BUG(); return NULL; } EXPORT_SYMBOL_GPL(alloc_vm_area); void free_vm_area(struct vm_struct *area) { BUG(); } EXPORT_SYMBOL_GPL(free_vm_area); |
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int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page *page) { return -EINVAL; } EXPORT_SYMBOL(vm_insert_page); |
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/* |
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* sys_brk() for the most part doesn't need the global kernel * lock, except when an application is doing something nasty * like trying to un-brk an area that has already been mapped * to a regular file. in this case, the unmapping will need * to invoke file system routines that need the global lock. */ |
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SYSCALL_DEFINE1(brk, unsigned long, brk) |
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{ struct mm_struct *mm = current->mm; if (brk < mm->start_brk || brk > mm->context.end_brk) return mm->brk; if (mm->brk == brk) return mm->brk; /* * Always allow shrinking brk */ if (brk <= mm->brk) { mm->brk = brk; return brk; } /* * Ok, looks good - let it rip. */ |
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flush_icache_range(mm->brk, brk); |
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return mm->brk = brk; } |
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/* * initialise the VMA and region record slabs */ void __init mmap_init(void) |
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{ |
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int ret; ret = percpu_counter_init(&vm_committed_as, 0); VM_BUG_ON(ret); |
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vm_region_jar = KMEM_CACHE(vm_region, SLAB_PANIC); |
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} |
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|
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/* |
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* validate the region tree * - the caller must hold the region lock |
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*/ |
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#ifdef CONFIG_DEBUG_NOMMU_REGIONS static noinline void validate_nommu_regions(void) |
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{ |
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struct vm_region *region, *last; struct rb_node *p, *lastp; |
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lastp = rb_first(&nommu_region_tree); if (!lastp) return; last = rb_entry(lastp, struct vm_region, vm_rb); |
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BUG_ON(unlikely(last->vm_end <= last->vm_start)); BUG_ON(unlikely(last->vm_top < last->vm_end)); |
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while ((p = rb_next(lastp))) { region = rb_entry(p, struct vm_region, vm_rb); last = rb_entry(lastp, struct vm_region, vm_rb); |
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BUG_ON(unlikely(region->vm_end <= region->vm_start)); BUG_ON(unlikely(region->vm_top < region->vm_end)); BUG_ON(unlikely(region->vm_start < last->vm_top)); |
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|
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lastp = p; } |
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} |
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#else |
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static void validate_nommu_regions(void) { } |
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542 |
#endif |
3034097a5 [PATCH] NOMMU: Or... |
543 544 |
/* |
8feae1311 NOMMU: Make VMAs ... |
545 |
* add a region into the global tree |
3034097a5 [PATCH] NOMMU: Or... |
546 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
547 |
static void add_nommu_region(struct vm_region *region) |
3034097a5 [PATCH] NOMMU: Or... |
548 |
{ |
8feae1311 NOMMU: Make VMAs ... |
549 550 |
struct vm_region *pregion; struct rb_node **p, *parent; |
3034097a5 [PATCH] NOMMU: Or... |
551 |
|
8feae1311 NOMMU: Make VMAs ... |
552 |
validate_nommu_regions(); |
8feae1311 NOMMU: Make VMAs ... |
553 554 555 556 557 558 559 560 561 562 563 564 565 |
parent = NULL; p = &nommu_region_tree.rb_node; while (*p) { parent = *p; pregion = rb_entry(parent, struct vm_region, vm_rb); if (region->vm_start < pregion->vm_start) p = &(*p)->rb_left; else if (region->vm_start > pregion->vm_start) p = &(*p)->rb_right; else if (pregion == region) return; else BUG(); |
3034097a5 [PATCH] NOMMU: Or... |
566 |
} |
8feae1311 NOMMU: Make VMAs ... |
567 568 |
rb_link_node(®ion->vm_rb, parent, p); rb_insert_color(®ion->vm_rb, &nommu_region_tree); |
3034097a5 [PATCH] NOMMU: Or... |
569 |
|
8feae1311 NOMMU: Make VMAs ... |
570 |
validate_nommu_regions(); |
3034097a5 [PATCH] NOMMU: Or... |
571 |
} |
3034097a5 [PATCH] NOMMU: Or... |
572 573 |
/* |
8feae1311 NOMMU: Make VMAs ... |
574 |
* delete a region from the global tree |
930e652a2 [PATCH] NOMMU: Ma... |
575 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
576 |
static void delete_nommu_region(struct vm_region *region) |
930e652a2 [PATCH] NOMMU: Ma... |
577 |
{ |
8feae1311 NOMMU: Make VMAs ... |
578 |
BUG_ON(!nommu_region_tree.rb_node); |
930e652a2 [PATCH] NOMMU: Ma... |
579 |
|
8feae1311 NOMMU: Make VMAs ... |
580 581 582 |
validate_nommu_regions(); rb_erase(®ion->vm_rb, &nommu_region_tree); validate_nommu_regions(); |
57c8f63e8 nommu: stub expan... |
583 |
} |
930e652a2 [PATCH] NOMMU: Ma... |
584 |
/* |
8feae1311 NOMMU: Make VMAs ... |
585 |
* free a contiguous series of pages |
6fa5f80bc [PATCH] NOMMU: Ma... |
586 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
587 |
static void free_page_series(unsigned long from, unsigned long to) |
6fa5f80bc [PATCH] NOMMU: Ma... |
588 |
{ |
8feae1311 NOMMU: Make VMAs ... |
589 590 591 592 |
for (; from < to; from += PAGE_SIZE) { struct page *page = virt_to_page(from); kdebug("- free %lx", from); |
33e5d7697 nommu: fix a numb... |
593 |
atomic_long_dec(&mmap_pages_allocated); |
8feae1311 NOMMU: Make VMAs ... |
594 |
if (page_count(page) != 1) |
33e5d7697 nommu: fix a numb... |
595 596 |
kdebug("free page %p: refcount not one: %d", page, page_count(page)); |
8feae1311 NOMMU: Make VMAs ... |
597 |
put_page(page); |
6fa5f80bc [PATCH] NOMMU: Ma... |
598 |
} |
6fa5f80bc [PATCH] NOMMU: Ma... |
599 600 601 |
} /* |
8feae1311 NOMMU: Make VMAs ... |
602 |
* release a reference to a region |
33e5d7697 nommu: fix a numb... |
603 |
* - the caller must hold the region semaphore for writing, which this releases |
dd8632a12 NOMMU: Make mmap ... |
604 |
* - the region may not have been added to the tree yet, in which case vm_top |
8feae1311 NOMMU: Make VMAs ... |
605 |
* will equal vm_start |
3034097a5 [PATCH] NOMMU: Or... |
606 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
607 608 |
static void __put_nommu_region(struct vm_region *region) __releases(nommu_region_sem) |
1da177e4c Linux-2.6.12-rc2 |
609 |
{ |
1e2ae599d nommu: struct vm_... |
610 |
kenter("%p{%d}", region, region->vm_usage); |
1da177e4c Linux-2.6.12-rc2 |
611 |
|
8feae1311 NOMMU: Make VMAs ... |
612 |
BUG_ON(!nommu_region_tree.rb_node); |
1da177e4c Linux-2.6.12-rc2 |
613 |
|
1e2ae599d nommu: struct vm_... |
614 |
if (--region->vm_usage == 0) { |
dd8632a12 NOMMU: Make mmap ... |
615 |
if (region->vm_top > region->vm_start) |
8feae1311 NOMMU: Make VMAs ... |
616 617 618 619 620 621 622 623 624 625 |
delete_nommu_region(region); up_write(&nommu_region_sem); if (region->vm_file) fput(region->vm_file); /* IO memory and memory shared directly out of the pagecache * from ramfs/tmpfs mustn't be released here */ if (region->vm_flags & VM_MAPPED_COPY) { kdebug("free series"); |
dd8632a12 NOMMU: Make mmap ... |
626 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
627 628 629 630 |
} kmem_cache_free(vm_region_jar, region); } else { up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
631 |
} |
8feae1311 NOMMU: Make VMAs ... |
632 |
} |
1da177e4c Linux-2.6.12-rc2 |
633 |
|
8feae1311 NOMMU: Make VMAs ... |
634 635 636 637 638 639 640 |
/* * release a reference to a region */ static void put_nommu_region(struct vm_region *region) { down_write(&nommu_region_sem); __put_nommu_region(region); |
1da177e4c Linux-2.6.12-rc2 |
641 |
} |
3034097a5 [PATCH] NOMMU: Or... |
642 |
/* |
eb8cdec4a nommu: add suppor... |
643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 |
* update protection on a vma */ static void protect_vma(struct vm_area_struct *vma, unsigned long flags) { #ifdef CONFIG_MPU struct mm_struct *mm = vma->vm_mm; long start = vma->vm_start & PAGE_MASK; while (start < vma->vm_end) { protect_page(mm, start, flags); start += PAGE_SIZE; } update_protections(mm); #endif } /* |
8feae1311 NOMMU: Make VMAs ... |
659 660 661 662 |
* add a VMA into a process's mm_struct in the appropriate place in the list * and tree and add to the address space's page tree also if not an anonymous * page * - should be called with mm->mmap_sem held writelocked |
3034097a5 [PATCH] NOMMU: Or... |
663 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
664 |
static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
665 |
{ |
6038def0d mm: nommu: sort m... |
666 |
struct vm_area_struct *pvma, *prev; |
1da177e4c Linux-2.6.12-rc2 |
667 |
struct address_space *mapping; |
6038def0d mm: nommu: sort m... |
668 |
struct rb_node **p, *parent, *rb_prev; |
8feae1311 NOMMU: Make VMAs ... |
669 670 671 672 673 674 675 |
kenter(",%p", vma); BUG_ON(!vma->vm_region); mm->map_count++; vma->vm_mm = mm; |
1da177e4c Linux-2.6.12-rc2 |
676 |
|
eb8cdec4a nommu: add suppor... |
677 |
protect_vma(vma, vma->vm_flags); |
1da177e4c Linux-2.6.12-rc2 |
678 679 680 681 682 683 684 685 |
/* add the VMA to the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; flush_dcache_mmap_lock(mapping); vma_prio_tree_insert(vma, &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); } |
8feae1311 NOMMU: Make VMAs ... |
686 |
/* add the VMA to the tree */ |
6038def0d mm: nommu: sort m... |
687 |
parent = rb_prev = NULL; |
8feae1311 NOMMU: Make VMAs ... |
688 |
p = &mm->mm_rb.rb_node; |
1da177e4c Linux-2.6.12-rc2 |
689 690 691 |
while (*p) { parent = *p; pvma = rb_entry(parent, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
692 693 694 |
/* sort by: start addr, end addr, VMA struct addr in that order * (the latter is necessary as we may get identical VMAs) */ if (vma->vm_start < pvma->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
695 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
696 697 |
else if (vma->vm_start > pvma->vm_start) { rb_prev = parent; |
1da177e4c Linux-2.6.12-rc2 |
698 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
699 |
} else if (vma->vm_end < pvma->vm_end) |
8feae1311 NOMMU: Make VMAs ... |
700 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
701 702 |
else if (vma->vm_end > pvma->vm_end) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
703 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
704 |
} else if (vma < pvma) |
8feae1311 NOMMU: Make VMAs ... |
705 |
p = &(*p)->rb_left; |
6038def0d mm: nommu: sort m... |
706 707 |
else if (vma > pvma) { rb_prev = parent; |
8feae1311 NOMMU: Make VMAs ... |
708 |
p = &(*p)->rb_right; |
6038def0d mm: nommu: sort m... |
709 |
} else |
8feae1311 NOMMU: Make VMAs ... |
710 |
BUG(); |
1da177e4c Linux-2.6.12-rc2 |
711 712 713 |
} rb_link_node(&vma->vm_rb, parent, p); |
8feae1311 NOMMU: Make VMAs ... |
714 715 716 |
rb_insert_color(&vma->vm_rb, &mm->mm_rb); /* add VMA to the VMA list also */ |
6038def0d mm: nommu: sort m... |
717 718 719 |
prev = NULL; if (rb_prev) prev = rb_entry(rb_prev, struct vm_area_struct, vm_rb); |
8feae1311 NOMMU: Make VMAs ... |
720 |
|
6038def0d mm: nommu: sort m... |
721 |
__vma_link_list(mm, vma, prev, parent); |
1da177e4c Linux-2.6.12-rc2 |
722 |
} |
3034097a5 [PATCH] NOMMU: Or... |
723 |
/* |
8feae1311 NOMMU: Make VMAs ... |
724 |
* delete a VMA from its owning mm_struct and address space |
3034097a5 [PATCH] NOMMU: Or... |
725 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
726 |
static void delete_vma_from_mm(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
727 728 |
{ struct address_space *mapping; |
8feae1311 NOMMU: Make VMAs ... |
729 730 731 |
struct mm_struct *mm = vma->vm_mm; kenter("%p", vma); |
eb8cdec4a nommu: add suppor... |
732 |
protect_vma(vma, 0); |
8feae1311 NOMMU: Make VMAs ... |
733 734 735 |
mm->map_count--; if (mm->mmap_cache == vma) mm->mmap_cache = NULL; |
1da177e4c Linux-2.6.12-rc2 |
736 737 738 739 740 741 742 743 744 |
/* remove the VMA from the mapping */ if (vma->vm_file) { mapping = vma->vm_file->f_mapping; flush_dcache_mmap_lock(mapping); vma_prio_tree_remove(vma, &mapping->i_mmap); flush_dcache_mmap_unlock(mapping); } |
8feae1311 NOMMU: Make VMAs ... |
745 746 |
/* remove from the MM's tree and list */ rb_erase(&vma->vm_rb, &mm->mm_rb); |
b951bf2c4 mm: nommu: don't ... |
747 748 749 750 751 752 753 754 |
if (vma->vm_prev) vma->vm_prev->vm_next = vma->vm_next; else mm->mmap = vma->vm_next; if (vma->vm_next) vma->vm_next->vm_prev = vma->vm_prev; |
8feae1311 NOMMU: Make VMAs ... |
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 |
vma->vm_mm = NULL; } /* * destroy a VMA record */ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) { kenter("%p", vma); if (vma->vm_ops && vma->vm_ops->close) vma->vm_ops->close(vma); if (vma->vm_file) { fput(vma->vm_file); if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(mm); } put_nommu_region(vma->vm_region); kmem_cache_free(vm_area_cachep, vma); } /* * look up the first VMA in which addr resides, NULL if none * - should be called with mm->mmap_sem at least held readlocked */ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr) { struct vm_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
783 784 785 786 787 |
/* check the cache first */ vma = mm->mmap_cache; if (vma && vma->vm_start <= addr && vma->vm_end > addr) return vma; |
e922c4c53 mm: nommu: find v... |
788 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
789 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
790 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 |
if (vma->vm_start > addr) return NULL; if (vma->vm_end > addr) { mm->mmap_cache = vma; return vma; } } return NULL; } EXPORT_SYMBOL(find_vma); /* * find a VMA * - we don't extend stack VMAs under NOMMU conditions */ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr) { |
7561e8ca0 NOMMU: Revert 'no... |
809 |
return find_vma(mm, addr); |
8feae1311 NOMMU: Make VMAs ... |
810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 |
} /* * expand a stack to a given address * - not supported under NOMMU conditions */ int expand_stack(struct vm_area_struct *vma, unsigned long address) { return -ENOMEM; } /* * look up the first VMA exactly that exactly matches addr * - should be called with mm->mmap_sem at least held readlocked */ static struct vm_area_struct *find_vma_exact(struct mm_struct *mm, unsigned long addr, unsigned long len) { struct vm_area_struct *vma; |
8feae1311 NOMMU: Make VMAs ... |
830 831 832 833 834 835 |
unsigned long end = addr + len; /* check the cache first */ vma = mm->mmap_cache; if (vma && vma->vm_start == addr && vma->vm_end == end) return vma; |
e922c4c53 mm: nommu: find v... |
836 |
/* trawl the list (there may be multiple mappings in which addr |
8feae1311 NOMMU: Make VMAs ... |
837 |
* resides) */ |
e922c4c53 mm: nommu: find v... |
838 |
for (vma = mm->mmap; vma; vma = vma->vm_next) { |
8feae1311 NOMMU: Make VMAs ... |
839 840 841 842 843 844 845 846 847 848 849 |
if (vma->vm_start < addr) continue; if (vma->vm_start > addr) return NULL; if (vma->vm_end == end) { mm->mmap_cache = vma; return vma; } } return NULL; |
1da177e4c Linux-2.6.12-rc2 |
850 851 852 853 854 855 856 857 858 859 860 861 862 863 |
} /* * determine whether a mapping should be permitted and, if so, what sort of * mapping we're capable of supporting */ static int validate_mmap_request(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, unsigned long *_capabilities) { |
8feae1311 NOMMU: Make VMAs ... |
864 |
unsigned long capabilities, rlen; |
1da177e4c Linux-2.6.12-rc2 |
865 866 867 868 |
unsigned long reqprot = prot; int ret; /* do the simple checks first */ |
06aab5a30 NOMMU: Ignore mma... |
869 |
if (flags & MAP_FIXED) { |
1da177e4c Linux-2.6.12-rc2 |
870 871 872 873 874 875 876 877 878 879 |
printk(KERN_DEBUG "%d: Can't do fixed-address/overlay mmap of RAM ", current->pid); return -EINVAL; } if ((flags & MAP_TYPE) != MAP_PRIVATE && (flags & MAP_TYPE) != MAP_SHARED) return -EINVAL; |
f81cff0d4 [PATCH] uclinux: ... |
880 |
if (!len) |
1da177e4c Linux-2.6.12-rc2 |
881 |
return -EINVAL; |
f81cff0d4 [PATCH] uclinux: ... |
882 |
/* Careful about overflows.. */ |
8feae1311 NOMMU: Make VMAs ... |
883 884 |
rlen = PAGE_ALIGN(len); if (!rlen || rlen > TASK_SIZE) |
f81cff0d4 [PATCH] uclinux: ... |
885 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
886 |
/* offset overflow? */ |
8feae1311 NOMMU: Make VMAs ... |
887 |
if ((pgoff + (rlen >> PAGE_SHIFT)) < pgoff) |
f81cff0d4 [PATCH] uclinux: ... |
888 |
return -EOVERFLOW; |
1da177e4c Linux-2.6.12-rc2 |
889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 |
if (file) { /* validate file mapping requests */ struct address_space *mapping; /* files must support mmap */ if (!file->f_op || !file->f_op->mmap) return -ENODEV; /* work out if what we've got could possibly be shared * - we support chardevs that provide their own "memory" * - we support files/blockdevs that are memory backed */ mapping = file->f_mapping; if (!mapping) |
e9536ae72 [PATCH] struct pa... |
904 |
mapping = file->f_path.dentry->d_inode->i_mapping; |
1da177e4c Linux-2.6.12-rc2 |
905 906 907 908 909 910 911 912 |
capabilities = 0; if (mapping && mapping->backing_dev_info) capabilities = mapping->backing_dev_info->capabilities; if (!capabilities) { /* no explicit capabilities set, so assume some * defaults */ |
e9536ae72 [PATCH] struct pa... |
913 |
switch (file->f_path.dentry->d_inode->i_mode & S_IFMT) { |
1da177e4c Linux-2.6.12-rc2 |
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 |
case S_IFREG: case S_IFBLK: capabilities = BDI_CAP_MAP_COPY; break; case S_IFCHR: capabilities = BDI_CAP_MAP_DIRECT | BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP; break; default: return -EINVAL; } } /* eliminate any capabilities that we can't support on this * device */ if (!file->f_op->get_unmapped_area) capabilities &= ~BDI_CAP_MAP_DIRECT; if (!file->f_op->read) capabilities &= ~BDI_CAP_MAP_COPY; |
28d7a6ae9 nommu: check fd r... |
937 938 939 |
/* The file shall have been opened with read permission. */ if (!(file->f_mode & FMODE_READ)) return -EACCES; |
1da177e4c Linux-2.6.12-rc2 |
940 941 942 943 944 |
if (flags & MAP_SHARED) { /* do checks for writing, appending and locking */ if ((prot & PROT_WRITE) && !(file->f_mode & FMODE_WRITE)) return -EACCES; |
e9536ae72 [PATCH] struct pa... |
945 |
if (IS_APPEND(file->f_path.dentry->d_inode) && |
1da177e4c Linux-2.6.12-rc2 |
946 947 |
(file->f_mode & FMODE_WRITE)) return -EACCES; |
e9536ae72 [PATCH] struct pa... |
948 |
if (locks_verify_locked(file->f_path.dentry->d_inode)) |
1da177e4c Linux-2.6.12-rc2 |
949 950 951 952 |
return -EAGAIN; if (!(capabilities & BDI_CAP_MAP_DIRECT)) return -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
953 954 955 956 957 958 959 960 961 962 963 964 965 966 |
/* we mustn't privatise shared mappings */ capabilities &= ~BDI_CAP_MAP_COPY; } else { /* we're going to read the file into private memory we * allocate */ if (!(capabilities & BDI_CAP_MAP_COPY)) return -ENODEV; /* we don't permit a private writable mapping to be * shared with the backing device */ if (prot & PROT_WRITE) capabilities &= ~BDI_CAP_MAP_DIRECT; } |
3c7b20454 nommu: allow priv... |
967 968 969 970 971 972 973 974 975 976 977 978 979 980 |
if (capabilities & BDI_CAP_MAP_DIRECT) { if (((prot & PROT_READ) && !(capabilities & BDI_CAP_READ_MAP)) || ((prot & PROT_WRITE) && !(capabilities & BDI_CAP_WRITE_MAP)) || ((prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP)) ) { capabilities &= ~BDI_CAP_MAP_DIRECT; if (flags & MAP_SHARED) { printk(KERN_WARNING "MAP_SHARED not completely supported on !MMU "); return -EINVAL; } } } |
1da177e4c Linux-2.6.12-rc2 |
981 982 |
/* handle executable mappings and implied executable * mappings */ |
e9536ae72 [PATCH] struct pa... |
983 |
if (file->f_path.mnt->mnt_flags & MNT_NOEXEC) { |
1da177e4c Linux-2.6.12-rc2 |
984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 |
if (prot & PROT_EXEC) return -EPERM; } else if ((prot & PROT_READ) && !(prot & PROT_EXEC)) { /* handle implication of PROT_EXEC by PROT_READ */ if (current->personality & READ_IMPLIES_EXEC) { if (capabilities & BDI_CAP_EXEC_MAP) prot |= PROT_EXEC; } } else if ((prot & PROT_READ) && (prot & PROT_EXEC) && !(capabilities & BDI_CAP_EXEC_MAP) ) { /* backing file is not executable, try to copy */ capabilities &= ~BDI_CAP_MAP_DIRECT; } } else { /* anonymous mappings are always memory backed and can be * privately mapped */ capabilities = BDI_CAP_MAP_COPY; /* handle PROT_EXEC implication by PROT_READ */ if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC)) prot |= PROT_EXEC; } /* allow the security API to have its say */ |
ed0321895 security: Protect... |
1015 |
ret = security_file_mmap(file, reqprot, prot, flags, addr, 0); |
1da177e4c Linux-2.6.12-rc2 |
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 |
if (ret < 0) return ret; /* looks okay */ *_capabilities = capabilities; return 0; } /* * we've determined that we can make the mapping, now translate what we * now know into VMA flags */ static unsigned long determine_vm_flags(struct file *file, unsigned long prot, unsigned long flags, unsigned long capabilities) { unsigned long vm_flags; vm_flags = calc_vm_prot_bits(prot) | calc_vm_flag_bits(flags); |
1da177e4c Linux-2.6.12-rc2 |
1036 1037 1038 1039 |
/* vm_flags |= mm->def_flags; */ if (!(capabilities & BDI_CAP_MAP_DIRECT)) { /* attempt to share read-only copies of mapped file chunks */ |
3c7b20454 nommu: allow priv... |
1040 |
vm_flags |= VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC; |
1da177e4c Linux-2.6.12-rc2 |
1041 1042 |
if (file && !(prot & PROT_WRITE)) vm_flags |= VM_MAYSHARE; |
3c7b20454 nommu: allow priv... |
1043 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1044 1045 1046 |
/* overlay a shareable mapping on the backing device or inode * if possible - used for chardevs, ramfs/tmpfs/shmfs and * romfs/cramfs */ |
3c7b20454 nommu: allow priv... |
1047 |
vm_flags |= VM_MAYSHARE | (capabilities & BDI_CAP_VMFLAGS); |
1da177e4c Linux-2.6.12-rc2 |
1048 |
if (flags & MAP_SHARED) |
3c7b20454 nommu: allow priv... |
1049 |
vm_flags |= VM_SHARED; |
1da177e4c Linux-2.6.12-rc2 |
1050 1051 1052 1053 1054 1055 |
} /* refuse to let anyone share private mappings with this process if * it's being traced - otherwise breakpoints set in it may interfere * with another untraced process */ |
a288eecce ptrace: kill triv... |
1056 |
if ((flags & MAP_PRIVATE) && current->ptrace) |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 1059 1060 1061 1062 |
vm_flags &= ~VM_MAYSHARE; return vm_flags; } /* |
8feae1311 NOMMU: Make VMAs ... |
1063 1064 |
* set up a shared mapping on a file (the driver or filesystem provides and * pins the storage) |
1da177e4c Linux-2.6.12-rc2 |
1065 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1066 |
static int do_mmap_shared_file(struct vm_area_struct *vma) |
1da177e4c Linux-2.6.12-rc2 |
1067 1068 1069 1070 |
{ int ret; ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1071 1072 |
if (ret == 0) { vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1073 |
return 0; |
dd8632a12 NOMMU: Make mmap ... |
1074 |
} |
1da177e4c Linux-2.6.12-rc2 |
1075 1076 |
if (ret != -ENOSYS) return ret; |
3fa30460e nommu: fix an inc... |
1077 1078 1079 |
/* getting -ENOSYS indicates that direct mmap isn't possible (as * opposed to tried but failed) so we can only give a suitable error as * it's not possible to make a private copy if MAP_SHARED was given */ |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 1082 1083 1084 1085 |
return -ENODEV; } /* * set up a private mapping or an anonymous shared mapping */ |
8feae1311 NOMMU: Make VMAs ... |
1086 1087 |
static int do_mmap_private(struct vm_area_struct *vma, struct vm_region *region, |
645d83c5d NOMMU: Fix MAP_PR... |
1088 1089 |
unsigned long len, unsigned long capabilities) |
1da177e4c Linux-2.6.12-rc2 |
1090 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1091 |
struct page *pages; |
f67d9b157 nommu: add page a... |
1092 |
unsigned long total, point, n; |
1da177e4c Linux-2.6.12-rc2 |
1093 |
void *base; |
8feae1311 NOMMU: Make VMAs ... |
1094 |
int ret, order; |
1da177e4c Linux-2.6.12-rc2 |
1095 1096 1097 1098 1099 |
/* invoke the file's mapping function so that it can keep track of * shared mappings on devices or memory * - VM_MAYSHARE will be set if it may attempt to share */ |
645d83c5d NOMMU: Fix MAP_PR... |
1100 |
if (capabilities & BDI_CAP_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1101 |
ret = vma->vm_file->f_op->mmap(vma->vm_file, vma); |
dd8632a12 NOMMU: Make mmap ... |
1102 |
if (ret == 0) { |
1da177e4c Linux-2.6.12-rc2 |
1103 |
/* shouldn't return success if we're not sharing */ |
dd8632a12 NOMMU: Make mmap ... |
1104 1105 |
BUG_ON(!(vma->vm_flags & VM_MAYSHARE)); vma->vm_region->vm_top = vma->vm_region->vm_end; |
645d83c5d NOMMU: Fix MAP_PR... |
1106 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1107 |
} |
dd8632a12 NOMMU: Make mmap ... |
1108 1109 |
if (ret != -ENOSYS) return ret; |
1da177e4c Linux-2.6.12-rc2 |
1110 1111 1112 1113 1114 |
/* getting an ENOSYS error indicates that direct mmap isn't * possible (as opposed to tried but failed) so we'll try to * make a private copy of the data and map that instead */ } |
8feae1311 NOMMU: Make VMAs ... |
1115 |
|
1da177e4c Linux-2.6.12-rc2 |
1116 1117 1118 1119 |
/* allocate some memory to hold the mapping * - note that this may not return a page-aligned address if the object * we're allocating is smaller than a page */ |
f67d9b157 nommu: add page a... |
1120 |
order = get_order(len); |
8feae1311 NOMMU: Make VMAs ... |
1121 1122 1123 1124 |
kdebug("alloc order %d for %lx", order, len); pages = alloc_pages(GFP_KERNEL, order); if (!pages) |
1da177e4c Linux-2.6.12-rc2 |
1125 |
goto enomem; |
8feae1311 NOMMU: Make VMAs ... |
1126 |
total = 1 << order; |
33e5d7697 nommu: fix a numb... |
1127 |
atomic_long_add(total, &mmap_pages_allocated); |
8feae1311 NOMMU: Make VMAs ... |
1128 |
|
f67d9b157 nommu: add page a... |
1129 |
point = len >> PAGE_SHIFT; |
dd8632a12 NOMMU: Make mmap ... |
1130 1131 1132 1133 1134 1135 1136 1137 |
/* we allocated a power-of-2 sized page set, so we may want to trim off * the excess */ if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) { while (total > point) { order = ilog2(total - point); n = 1 << order; kdebug("shave %lu/%lu @%lu", n, total - point, total); |
33e5d7697 nommu: fix a numb... |
1138 |
atomic_long_sub(n, &mmap_pages_allocated); |
dd8632a12 NOMMU: Make mmap ... |
1139 1140 1141 1142 |
total -= n; set_page_refcounted(pages + total); __free_pages(pages + total, order); } |
8feae1311 NOMMU: Make VMAs ... |
1143 |
} |
8feae1311 NOMMU: Make VMAs ... |
1144 1145 |
for (point = 1; point < total; point++) set_page_refcounted(&pages[point]); |
1da177e4c Linux-2.6.12-rc2 |
1146 |
|
8feae1311 NOMMU: Make VMAs ... |
1147 1148 1149 |
base = page_address(pages); region->vm_flags = vma->vm_flags |= VM_MAPPED_COPY; region->vm_start = (unsigned long) base; |
f67d9b157 nommu: add page a... |
1150 |
region->vm_end = region->vm_start + len; |
dd8632a12 NOMMU: Make mmap ... |
1151 |
region->vm_top = region->vm_start + (total << PAGE_SHIFT); |
8feae1311 NOMMU: Make VMAs ... |
1152 1153 1154 |
vma->vm_start = region->vm_start; vma->vm_end = region->vm_start + len; |
1da177e4c Linux-2.6.12-rc2 |
1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 |
if (vma->vm_file) { /* read the contents of a file into the copy */ mm_segment_t old_fs; loff_t fpos; fpos = vma->vm_pgoff; fpos <<= PAGE_SHIFT; old_fs = get_fs(); set_fs(KERNEL_DS); |
f67d9b157 nommu: add page a... |
1166 |
ret = vma->vm_file->f_op->read(vma->vm_file, base, len, &fpos); |
1da177e4c Linux-2.6.12-rc2 |
1167 1168 1169 1170 1171 1172 |
set_fs(old_fs); if (ret < 0) goto error_free; /* clear the last little bit */ |
f67d9b157 nommu: add page a... |
1173 1174 |
if (ret < len) memset(base + ret, 0, len - ret); |
1da177e4c Linux-2.6.12-rc2 |
1175 |
|
1da177e4c Linux-2.6.12-rc2 |
1176 1177 1178 1179 1180 |
} return 0; error_free: |
7223bb4a8 mm: nommu: fix a ... |
1181 |
free_page_series(region->vm_start, region->vm_top); |
8feae1311 NOMMU: Make VMAs ... |
1182 1183 |
region->vm_start = vma->vm_start = 0; region->vm_end = vma->vm_end = 0; |
dd8632a12 NOMMU: Make mmap ... |
1184 |
region->vm_top = 0; |
1da177e4c Linux-2.6.12-rc2 |
1185 1186 1187 |
return ret; enomem: |
05ae6fa31 uclinux: add proc... |
1188 1189 1190 |
printk("Allocation of length %lu from process %d (%s) failed ", len, current->pid, current->comm); |
7bf02ea22 arch, mm: filter ... |
1191 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 |
return -ENOMEM; } /* * handle mapping creation for uClinux */ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff) { |
8feae1311 NOMMU: Make VMAs ... |
1205 1206 |
struct vm_area_struct *vma; struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1207 |
struct rb_node *rb; |
8feae1311 NOMMU: Make VMAs ... |
1208 |
unsigned long capabilities, vm_flags, result; |
1da177e4c Linux-2.6.12-rc2 |
1209 |
int ret; |
8feae1311 NOMMU: Make VMAs ... |
1210 |
kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff); |
1da177e4c Linux-2.6.12-rc2 |
1211 1212 1213 1214 |
/* decide whether we should attempt the mapping, and if so what sort of * mapping */ ret = validate_mmap_request(file, addr, len, prot, flags, pgoff, &capabilities); |
8feae1311 NOMMU: Make VMAs ... |
1215 1216 |
if (ret < 0) { kleave(" = %d [val]", ret); |
1da177e4c Linux-2.6.12-rc2 |
1217 |
return ret; |
8feae1311 NOMMU: Make VMAs ... |
1218 |
} |
1da177e4c Linux-2.6.12-rc2 |
1219 |
|
06aab5a30 NOMMU: Ignore mma... |
1220 1221 |
/* we ignore the address hint */ addr = 0; |
f67d9b157 nommu: add page a... |
1222 |
len = PAGE_ALIGN(len); |
06aab5a30 NOMMU: Ignore mma... |
1223 |
|
1da177e4c Linux-2.6.12-rc2 |
1224 1225 1226 |
/* we've determined that we can make the mapping, now translate what we * now know into VMA flags */ vm_flags = determine_vm_flags(file, prot, flags, capabilities); |
8feae1311 NOMMU: Make VMAs ... |
1227 1228 1229 1230 1231 1232 1233 1234 |
/* we're going to need to record the mapping */ region = kmem_cache_zalloc(vm_region_jar, GFP_KERNEL); if (!region) goto error_getting_region; vma = kmem_cache_zalloc(vm_area_cachep, GFP_KERNEL); if (!vma) goto error_getting_vma; |
1da177e4c Linux-2.6.12-rc2 |
1235 |
|
1e2ae599d nommu: struct vm_... |
1236 |
region->vm_usage = 1; |
8feae1311 NOMMU: Make VMAs ... |
1237 1238 |
region->vm_flags = vm_flags; region->vm_pgoff = pgoff; |
5beb49305 mm: change anon_v... |
1239 |
INIT_LIST_HEAD(&vma->anon_vma_chain); |
8feae1311 NOMMU: Make VMAs ... |
1240 1241 |
vma->vm_flags = vm_flags; vma->vm_pgoff = pgoff; |
1da177e4c Linux-2.6.12-rc2 |
1242 |
|
8feae1311 NOMMU: Make VMAs ... |
1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 |
if (file) { region->vm_file = file; get_file(file); vma->vm_file = file; get_file(file); if (vm_flags & VM_EXECUTABLE) { added_exe_file_vma(current->mm); vma->vm_mm = current->mm; } } down_write(&nommu_region_sem); /* if we want to share, we need to check for regions created by other |
1da177e4c Linux-2.6.12-rc2 |
1257 |
* mmap() calls that overlap with our proposed mapping |
8feae1311 NOMMU: Make VMAs ... |
1258 |
* - we can only share with a superset match on most regular files |
1da177e4c Linux-2.6.12-rc2 |
1259 1260 1261 1262 1263 1264 |
* - shared mappings on character devices and memory backed files are * permitted to overlap inexactly as far as we are concerned for in * these cases, sharing is handled in the driver or filesystem rather * than here */ if (vm_flags & VM_MAYSHARE) { |
8feae1311 NOMMU: Make VMAs ... |
1265 1266 |
struct vm_region *pregion; unsigned long pglen, rpglen, pgend, rpgend, start; |
1da177e4c Linux-2.6.12-rc2 |
1267 |
|
8feae1311 NOMMU: Make VMAs ... |
1268 1269 |
pglen = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; pgend = pgoff + pglen; |
165b23927 [PATCH] NOMMU: ma... |
1270 |
|
8feae1311 NOMMU: Make VMAs ... |
1271 1272 |
for (rb = rb_first(&nommu_region_tree); rb; rb = rb_next(rb)) { pregion = rb_entry(rb, struct vm_region, vm_rb); |
1da177e4c Linux-2.6.12-rc2 |
1273 |
|
8feae1311 NOMMU: Make VMAs ... |
1274 |
if (!(pregion->vm_flags & VM_MAYSHARE)) |
1da177e4c Linux-2.6.12-rc2 |
1275 1276 1277 |
continue; /* search for overlapping mappings on the same file */ |
8feae1311 NOMMU: Make VMAs ... |
1278 1279 |
if (pregion->vm_file->f_path.dentry->d_inode != file->f_path.dentry->d_inode) |
1da177e4c Linux-2.6.12-rc2 |
1280 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1281 |
if (pregion->vm_pgoff >= pgend) |
1da177e4c Linux-2.6.12-rc2 |
1282 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1283 1284 1285 1286 |
rpglen = pregion->vm_end - pregion->vm_start; rpglen = (rpglen + PAGE_SIZE - 1) >> PAGE_SHIFT; rpgend = pregion->vm_pgoff + rpglen; if (pgoff >= rpgend) |
1da177e4c Linux-2.6.12-rc2 |
1287 |
continue; |
8feae1311 NOMMU: Make VMAs ... |
1288 1289 1290 1291 1292 |
/* handle inexactly overlapping matches between * mappings */ if ((pregion->vm_pgoff != pgoff || rpglen != pglen) && !(pgoff >= pregion->vm_pgoff && pgend <= rpgend)) { /* new mapping is not a subset of the region */ |
1da177e4c Linux-2.6.12-rc2 |
1293 1294 1295 1296 |
if (!(capabilities & BDI_CAP_MAP_DIRECT)) goto sharing_violation; continue; } |
8feae1311 NOMMU: Make VMAs ... |
1297 |
/* we've found a region we can share */ |
1e2ae599d nommu: struct vm_... |
1298 |
pregion->vm_usage++; |
8feae1311 NOMMU: Make VMAs ... |
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 |
vma->vm_region = pregion; start = pregion->vm_start; start += (pgoff - pregion->vm_pgoff) << PAGE_SHIFT; vma->vm_start = start; vma->vm_end = start + len; if (pregion->vm_flags & VM_MAPPED_COPY) { kdebug("share copy"); vma->vm_flags |= VM_MAPPED_COPY; } else { kdebug("share mmap"); ret = do_mmap_shared_file(vma); if (ret < 0) { vma->vm_region = NULL; vma->vm_start = 0; vma->vm_end = 0; |
1e2ae599d nommu: struct vm_... |
1315 |
pregion->vm_usage--; |
8feae1311 NOMMU: Make VMAs ... |
1316 1317 1318 1319 1320 1321 1322 1323 1324 |
pregion = NULL; goto error_just_free; } } fput(region->vm_file); kmem_cache_free(vm_region_jar, region); region = pregion; result = start; goto share; |
1da177e4c Linux-2.6.12-rc2 |
1325 |
} |
1da177e4c Linux-2.6.12-rc2 |
1326 1327 1328 1329 |
/* obtain the address at which to make a shared mapping * - this is the hook for quasi-memory character devices to * tell us the location of a shared mapping */ |
645d83c5d NOMMU: Fix MAP_PR... |
1330 |
if (capabilities & BDI_CAP_MAP_DIRECT) { |
1da177e4c Linux-2.6.12-rc2 |
1331 1332 |
addr = file->f_op->get_unmapped_area(file, addr, len, pgoff, flags); |
bb005a59e mm: nommu: fix a ... |
1333 |
if (IS_ERR_VALUE(addr)) { |
1da177e4c Linux-2.6.12-rc2 |
1334 |
ret = addr; |
bb005a59e mm: nommu: fix a ... |
1335 |
if (ret != -ENOSYS) |
8feae1311 NOMMU: Make VMAs ... |
1336 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1337 1338 1339 1340 |
/* the driver refused to tell us where to site * the mapping so we'll have to attempt to copy * it */ |
bb005a59e mm: nommu: fix a ... |
1341 |
ret = -ENODEV; |
1da177e4c Linux-2.6.12-rc2 |
1342 |
if (!(capabilities & BDI_CAP_MAP_COPY)) |
8feae1311 NOMMU: Make VMAs ... |
1343 |
goto error_just_free; |
1da177e4c Linux-2.6.12-rc2 |
1344 1345 |
capabilities &= ~BDI_CAP_MAP_DIRECT; |
8feae1311 NOMMU: Make VMAs ... |
1346 1347 1348 |
} else { vma->vm_start = region->vm_start = addr; vma->vm_end = region->vm_end = addr + len; |
1da177e4c Linux-2.6.12-rc2 |
1349 1350 1351 |
} } } |
8feae1311 NOMMU: Make VMAs ... |
1352 |
vma->vm_region = region; |
1da177e4c Linux-2.6.12-rc2 |
1353 |
|
645d83c5d NOMMU: Fix MAP_PR... |
1354 1355 1356 |
/* set up the mapping * - the region is filled in if BDI_CAP_MAP_DIRECT is still set */ |
1da177e4c Linux-2.6.12-rc2 |
1357 |
if (file && vma->vm_flags & VM_SHARED) |
8feae1311 NOMMU: Make VMAs ... |
1358 |
ret = do_mmap_shared_file(vma); |
1da177e4c Linux-2.6.12-rc2 |
1359 |
else |
645d83c5d NOMMU: Fix MAP_PR... |
1360 |
ret = do_mmap_private(vma, region, len, capabilities); |
1da177e4c Linux-2.6.12-rc2 |
1361 |
if (ret < 0) |
645d83c5d NOMMU: Fix MAP_PR... |
1362 1363 |
goto error_just_free; add_nommu_region(region); |
8feae1311 NOMMU: Make VMAs ... |
1364 |
|
ea6376395 nommu: fix malloc... |
1365 1366 1367 1368 |
/* clear anonymous mappings that don't ask for uninitialized data */ if (!vma->vm_file && !(flags & MAP_UNINITIALIZED)) memset((void *)region->vm_start, 0, region->vm_end - region->vm_start); |
1da177e4c Linux-2.6.12-rc2 |
1369 |
/* okay... we have a mapping; now we have to register it */ |
8feae1311 NOMMU: Make VMAs ... |
1370 |
result = vma->vm_start; |
1da177e4c Linux-2.6.12-rc2 |
1371 |
|
1da177e4c Linux-2.6.12-rc2 |
1372 |
current->mm->total_vm += len >> PAGE_SHIFT; |
8feae1311 NOMMU: Make VMAs ... |
1373 1374 |
share: add_vma_to_mm(current->mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1375 |
|
cfe79c00a NOMMU: Avoiding d... |
1376 1377 1378 1379 1380 1381 |
/* we flush the region from the icache only when the first executable * mapping of it is made */ if (vma->vm_flags & VM_EXEC && !region->vm_icache_flushed) { flush_icache_range(region->vm_start, region->vm_end); region->vm_icache_flushed = true; } |
1da177e4c Linux-2.6.12-rc2 |
1382 |
|
cfe79c00a NOMMU: Avoiding d... |
1383 |
up_write(&nommu_region_sem); |
1da177e4c Linux-2.6.12-rc2 |
1384 |
|
8feae1311 NOMMU: Make VMAs ... |
1385 1386 |
kleave(" = %lx", result); return result; |
1da177e4c Linux-2.6.12-rc2 |
1387 |
|
8feae1311 NOMMU: Make VMAs ... |
1388 1389 1390 |
error_just_free: up_write(&nommu_region_sem); error: |
89a864027 NOMMU: Don't pass... |
1391 1392 |
if (region->vm_file) fput(region->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1393 |
kmem_cache_free(vm_region_jar, region); |
89a864027 NOMMU: Don't pass... |
1394 1395 |
if (vma->vm_file) fput(vma->vm_file); |
8feae1311 NOMMU: Make VMAs ... |
1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 |
if (vma->vm_flags & VM_EXECUTABLE) removed_exe_file_vma(vma->vm_mm); kmem_cache_free(vm_area_cachep, vma); kleave(" = %d", ret); return ret; sharing_violation: up_write(&nommu_region_sem); printk(KERN_WARNING "Attempt to share mismatched mappings "); ret = -EINVAL; goto error; |
1da177e4c Linux-2.6.12-rc2 |
1408 |
|
8feae1311 NOMMU: Make VMAs ... |
1409 1410 1411 1412 1413 |
error_getting_vma: kmem_cache_free(vm_region_jar, region); printk(KERN_WARNING "Allocation of vma for %lu byte allocation" " from process %d failed ", |
1da177e4c Linux-2.6.12-rc2 |
1414 |
len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1415 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1416 |
return -ENOMEM; |
8feae1311 NOMMU: Make VMAs ... |
1417 1418 1419 1420 |
error_getting_region: printk(KERN_WARNING "Allocation of vm region for %lu byte allocation" " from process %d failed ", |
1da177e4c Linux-2.6.12-rc2 |
1421 |
len, current->pid); |
7bf02ea22 arch, mm: filter ... |
1422 |
show_free_areas(0); |
1da177e4c Linux-2.6.12-rc2 |
1423 1424 |
return -ENOMEM; } |
b50731732 nommu: vmalloc_32... |
1425 |
EXPORT_SYMBOL(do_mmap_pgoff); |
1da177e4c Linux-2.6.12-rc2 |
1426 |
|
66f0dc481 mm: move sys_mmap... |
1427 1428 1429 1430 1431 1432 |
SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len, unsigned long, prot, unsigned long, flags, unsigned long, fd, unsigned long, pgoff) { struct file *file = NULL; unsigned long retval = -EBADF; |
120a795da audit mmap |
1433 |
audit_mmap_fd(fd, flags); |
66f0dc481 mm: move sys_mmap... |
1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 |
if (!(flags & MAP_ANONYMOUS)) { file = fget(fd); if (!file) goto out; } flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE); down_write(¤t->mm->mmap_sem); retval = do_mmap_pgoff(file, addr, len, prot, flags, pgoff); up_write(¤t->mm->mmap_sem); if (file) fput(file); out: return retval; } |
a4679373c Add generic sys_o... |
1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 |
#ifdef __ARCH_WANT_SYS_OLD_MMAP struct mmap_arg_struct { unsigned long addr; unsigned long len; unsigned long prot; unsigned long flags; unsigned long fd; unsigned long offset; }; SYSCALL_DEFINE1(old_mmap, struct mmap_arg_struct __user *, arg) { struct mmap_arg_struct a; if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; if (a.offset & ~PAGE_MASK) return -EINVAL; return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT); } #endif /* __ARCH_WANT_SYS_OLD_MMAP */ |
1da177e4c Linux-2.6.12-rc2 |
1474 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1475 1476 |
* split a vma into two pieces at address 'addr', a new vma is allocated either * for the first part or the tail. |
1da177e4c Linux-2.6.12-rc2 |
1477 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1478 1479 |
int split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) |
1da177e4c Linux-2.6.12-rc2 |
1480 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1481 1482 1483 |
struct vm_area_struct *new; struct vm_region *region; unsigned long npages; |
1da177e4c Linux-2.6.12-rc2 |
1484 |
|
8feae1311 NOMMU: Make VMAs ... |
1485 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1486 |
|
779c10232 nommu: remove a s... |
1487 1488 1489 |
/* we're only permitted to split anonymous regions (these should have * only a single usage on the region) */ if (vma->vm_file) |
8feae1311 NOMMU: Make VMAs ... |
1490 |
return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1491 |
|
8feae1311 NOMMU: Make VMAs ... |
1492 1493 |
if (mm->map_count >= sysctl_max_map_count) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1494 |
|
8feae1311 NOMMU: Make VMAs ... |
1495 1496 1497 |
region = kmem_cache_alloc(vm_region_jar, GFP_KERNEL); if (!region) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1498 |
|
8feae1311 NOMMU: Make VMAs ... |
1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 |
new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); if (!new) { kmem_cache_free(vm_region_jar, region); return -ENOMEM; } /* most fields are the same, copy all, and then fixup */ *new = *vma; *region = *vma->vm_region; new->vm_region = region; npages = (addr - vma->vm_start) >> PAGE_SHIFT; if (new_below) { |
dd8632a12 NOMMU: Make mmap ... |
1513 |
region->vm_top = region->vm_end = new->vm_end = addr; |
8feae1311 NOMMU: Make VMAs ... |
1514 1515 1516 |
} else { region->vm_start = new->vm_start = addr; region->vm_pgoff = new->vm_pgoff += npages; |
1da177e4c Linux-2.6.12-rc2 |
1517 |
} |
8feae1311 NOMMU: Make VMAs ... |
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 |
if (new->vm_ops && new->vm_ops->open) new->vm_ops->open(new); delete_vma_from_mm(vma); down_write(&nommu_region_sem); delete_nommu_region(vma->vm_region); if (new_below) { vma->vm_region->vm_start = vma->vm_start = addr; vma->vm_region->vm_pgoff = vma->vm_pgoff += npages; } else { vma->vm_region->vm_end = vma->vm_end = addr; |
dd8632a12 NOMMU: Make mmap ... |
1530 |
vma->vm_region->vm_top = addr; |
8feae1311 NOMMU: Make VMAs ... |
1531 1532 1533 1534 1535 1536 1537 |
} add_nommu_region(vma->vm_region); add_nommu_region(new->vm_region); up_write(&nommu_region_sem); add_vma_to_mm(mm, vma); add_vma_to_mm(mm, new); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1538 |
} |
3034097a5 [PATCH] NOMMU: Or... |
1539 |
/* |
8feae1311 NOMMU: Make VMAs ... |
1540 1541 |
* shrink a VMA by removing the specified chunk from either the beginning or * the end |
3034097a5 [PATCH] NOMMU: Or... |
1542 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1543 1544 1545 |
static int shrink_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long from, unsigned long to) |
1da177e4c Linux-2.6.12-rc2 |
1546 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1547 |
struct vm_region *region; |
1da177e4c Linux-2.6.12-rc2 |
1548 |
|
8feae1311 NOMMU: Make VMAs ... |
1549 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1550 |
|
8feae1311 NOMMU: Make VMAs ... |
1551 1552 1553 1554 1555 1556 1557 1558 |
/* adjust the VMA's pointers, which may reposition it in the MM's tree * and list */ delete_vma_from_mm(vma); if (from > vma->vm_start) vma->vm_end = from; else vma->vm_start = to; add_vma_to_mm(mm, vma); |
1da177e4c Linux-2.6.12-rc2 |
1559 |
|
8feae1311 NOMMU: Make VMAs ... |
1560 1561 |
/* cut the backing region down to size */ region = vma->vm_region; |
1e2ae599d nommu: struct vm_... |
1562 |
BUG_ON(region->vm_usage != 1); |
8feae1311 NOMMU: Make VMAs ... |
1563 1564 1565 |
down_write(&nommu_region_sem); delete_nommu_region(region); |
dd8632a12 NOMMU: Make mmap ... |
1566 1567 1568 1569 |
if (from > region->vm_start) { to = region->vm_top; region->vm_top = region->vm_end = from; } else { |
8feae1311 NOMMU: Make VMAs ... |
1570 |
region->vm_start = to; |
dd8632a12 NOMMU: Make mmap ... |
1571 |
} |
8feae1311 NOMMU: Make VMAs ... |
1572 1573 1574 1575 1576 1577 |
add_nommu_region(region); up_write(&nommu_region_sem); free_page_series(from, to); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1578 |
|
8feae1311 NOMMU: Make VMAs ... |
1579 1580 1581 1582 1583 1584 1585 1586 |
/* * release a mapping * - under NOMMU conditions the chunk to be unmapped must be backed by a single * VMA, though it need not cover the whole VMA */ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len) { struct vm_area_struct *vma; |
f67d9b157 nommu: add page a... |
1587 |
unsigned long end; |
8feae1311 NOMMU: Make VMAs ... |
1588 |
int ret; |
1da177e4c Linux-2.6.12-rc2 |
1589 |
|
8feae1311 NOMMU: Make VMAs ... |
1590 |
kenter(",%lx,%zx", start, len); |
1da177e4c Linux-2.6.12-rc2 |
1591 |
|
f67d9b157 nommu: add page a... |
1592 |
len = PAGE_ALIGN(len); |
8feae1311 NOMMU: Make VMAs ... |
1593 1594 |
if (len == 0) return -EINVAL; |
365e9c87a [PATCH] mm: updat... |
1595 |
|
f67d9b157 nommu: add page a... |
1596 |
end = start + len; |
8feae1311 NOMMU: Make VMAs ... |
1597 1598 1599 |
/* find the first potentially overlapping VMA */ vma = find_vma(mm, start); if (!vma) { |
33e5d7697 nommu: fix a numb... |
1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 |
static int limit = 0; if (limit < 5) { printk(KERN_WARNING "munmap of memory not mmapped by process %d" " (%s): 0x%lx-0x%lx ", current->pid, current->comm, start, start + len - 1); limit++; } |
8feae1311 NOMMU: Make VMAs ... |
1610 1611 |
return -EINVAL; } |
1da177e4c Linux-2.6.12-rc2 |
1612 |
|
8feae1311 NOMMU: Make VMAs ... |
1613 1614 1615 1616 1617 1618 1619 1620 1621 |
/* we're allowed to split an anonymous VMA but not a file-backed one */ if (vma->vm_file) { do { if (start > vma->vm_start) { kleave(" = -EINVAL [miss]"); return -EINVAL; } if (end == vma->vm_end) goto erase_whole_vma; |
d75a310c4 mm: nommu: check ... |
1622 1623 |
vma = vma->vm_next; } while (vma); |
8feae1311 NOMMU: Make VMAs ... |
1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 |
kleave(" = -EINVAL [split file]"); return -EINVAL; } else { /* the chunk must be a subset of the VMA found */ if (start == vma->vm_start && end == vma->vm_end) goto erase_whole_vma; if (start < vma->vm_start || end > vma->vm_end) { kleave(" = -EINVAL [superset]"); return -EINVAL; } if (start & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned start]"); return -EINVAL; } if (end != vma->vm_end && end & ~PAGE_MASK) { kleave(" = -EINVAL [unaligned split]"); return -EINVAL; } if (start != vma->vm_start && end != vma->vm_end) { ret = split_vma(mm, vma, start, 1); if (ret < 0) { kleave(" = %d [split]", ret); return ret; } } return shrink_vma(mm, vma, start, end); } |
1da177e4c Linux-2.6.12-rc2 |
1651 |
|
8feae1311 NOMMU: Make VMAs ... |
1652 1653 1654 1655 |
erase_whole_vma: delete_vma_from_mm(vma); delete_vma(mm, vma); kleave(" = 0"); |
1da177e4c Linux-2.6.12-rc2 |
1656 1657 |
return 0; } |
b50731732 nommu: vmalloc_32... |
1658 |
EXPORT_SYMBOL(do_munmap); |
1da177e4c Linux-2.6.12-rc2 |
1659 |
|
6a6160a7b [CVE-2009-0029] S... |
1660 |
SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len) |
3034097a5 [PATCH] NOMMU: Or... |
1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 |
{ int ret; struct mm_struct *mm = current->mm; down_write(&mm->mmap_sem); ret = do_munmap(mm, addr, len); up_write(&mm->mmap_sem); return ret; } /* |
8feae1311 NOMMU: Make VMAs ... |
1672 |
* release all the mappings made in a process's VM space |
3034097a5 [PATCH] NOMMU: Or... |
1673 |
*/ |
8feae1311 NOMMU: Make VMAs ... |
1674 |
void exit_mmap(struct mm_struct *mm) |
1da177e4c Linux-2.6.12-rc2 |
1675 |
{ |
8feae1311 NOMMU: Make VMAs ... |
1676 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1677 |
|
8feae1311 NOMMU: Make VMAs ... |
1678 1679 |
if (!mm) return; |
1da177e4c Linux-2.6.12-rc2 |
1680 |
|
8feae1311 NOMMU: Make VMAs ... |
1681 |
kenter(""); |
1da177e4c Linux-2.6.12-rc2 |
1682 |
|
8feae1311 NOMMU: Make VMAs ... |
1683 |
mm->total_vm = 0; |
1da177e4c Linux-2.6.12-rc2 |
1684 |
|
8feae1311 NOMMU: Make VMAs ... |
1685 1686 1687 1688 |
while ((vma = mm->mmap)) { mm->mmap = vma->vm_next; delete_vma_from_mm(vma); delete_vma(mm, vma); |
04c349615 nommu: yield CPU ... |
1689 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
1690 |
} |
8feae1311 NOMMU: Make VMAs ... |
1691 1692 |
kleave(""); |
1da177e4c Linux-2.6.12-rc2 |
1693 |
} |
1da177e4c Linux-2.6.12-rc2 |
1694 1695 1696 1697 1698 1699 |
unsigned long do_brk(unsigned long addr, unsigned long len) { return -ENOMEM; } /* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1700 1701 |
* expand (or shrink) an existing mapping, potentially moving it at the same * time (controlled by the MREMAP_MAYMOVE flag and available VM space) |
1da177e4c Linux-2.6.12-rc2 |
1702 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1703 |
* under NOMMU conditions, we only permit changing a mapping's size, and only |
8feae1311 NOMMU: Make VMAs ... |
1704 1705 |
* as long as it stays within the region allocated by do_mmap_private() and the * block is not shareable |
1da177e4c Linux-2.6.12-rc2 |
1706 |
* |
6fa5f80bc [PATCH] NOMMU: Ma... |
1707 |
* MREMAP_FIXED is not supported under NOMMU conditions |
1da177e4c Linux-2.6.12-rc2 |
1708 1709 1710 1711 1712 |
*/ unsigned long do_mremap(unsigned long addr, unsigned long old_len, unsigned long new_len, unsigned long flags, unsigned long new_addr) { |
6fa5f80bc [PATCH] NOMMU: Ma... |
1713 |
struct vm_area_struct *vma; |
1da177e4c Linux-2.6.12-rc2 |
1714 1715 |
/* insanity checks first */ |
f67d9b157 nommu: add page a... |
1716 1717 |
old_len = PAGE_ALIGN(old_len); new_len = PAGE_ALIGN(new_len); |
8feae1311 NOMMU: Make VMAs ... |
1718 |
if (old_len == 0 || new_len == 0) |
1da177e4c Linux-2.6.12-rc2 |
1719 |
return (unsigned long) -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1720 1721 |
if (addr & ~PAGE_MASK) return -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1722 1723 |
if (flags & MREMAP_FIXED && new_addr != addr) return (unsigned long) -EINVAL; |
8feae1311 NOMMU: Make VMAs ... |
1724 |
vma = find_vma_exact(current->mm, addr, old_len); |
6fa5f80bc [PATCH] NOMMU: Ma... |
1725 1726 |
if (!vma) return (unsigned long) -EINVAL; |
1da177e4c Linux-2.6.12-rc2 |
1727 |
|
6fa5f80bc [PATCH] NOMMU: Ma... |
1728 |
if (vma->vm_end != vma->vm_start + old_len) |
1da177e4c Linux-2.6.12-rc2 |
1729 |
return (unsigned long) -EFAULT; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1730 |
if (vma->vm_flags & VM_MAYSHARE) |
1da177e4c Linux-2.6.12-rc2 |
1731 |
return (unsigned long) -EPERM; |
8feae1311 NOMMU: Make VMAs ... |
1732 |
if (new_len > vma->vm_region->vm_end - vma->vm_region->vm_start) |
1da177e4c Linux-2.6.12-rc2 |
1733 1734 1735 |
return (unsigned long) -ENOMEM; /* all checks complete - do it */ |
6fa5f80bc [PATCH] NOMMU: Ma... |
1736 |
vma->vm_end = vma->vm_start + new_len; |
6fa5f80bc [PATCH] NOMMU: Ma... |
1737 1738 |
return vma->vm_start; } |
b50731732 nommu: vmalloc_32... |
1739 |
EXPORT_SYMBOL(do_mremap); |
6fa5f80bc [PATCH] NOMMU: Ma... |
1740 |
|
6a6160a7b [CVE-2009-0029] S... |
1741 1742 1743 |
SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, unsigned long, new_len, unsigned long, flags, unsigned long, new_addr) |
6fa5f80bc [PATCH] NOMMU: Ma... |
1744 1745 1746 1747 1748 1749 1750 |
{ unsigned long ret; down_write(¤t->mm->mmap_sem); ret = do_mremap(addr, old_len, new_len, flags, new_addr); up_write(¤t->mm->mmap_sem); return ret; |
1da177e4c Linux-2.6.12-rc2 |
1751 |
} |
6aab341e0 mm: re-architect ... |
1752 |
struct page *follow_page(struct vm_area_struct *vma, unsigned long address, |
deceb6cd1 [PATCH] mm: follo... |
1753 |
unsigned int foll_flags) |
1da177e4c Linux-2.6.12-rc2 |
1754 1755 1756 |
{ return NULL; } |
8f3b1327a mm/nommu.c: fix r... |
1757 1758 |
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t prot) |
1da177e4c Linux-2.6.12-rc2 |
1759 |
{ |
8f3b1327a mm/nommu.c: fix r... |
1760 1761 1762 1763 |
if (addr != (pfn << PAGE_SHIFT)) return -EINVAL; vma->vm_flags |= VM_IO | VM_RESERVED | VM_PFNMAP; |
66aa2b4b1 [PATCH] uclinux: ... |
1764 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
1765 |
} |
22c4af409 [PATCH] nommu: ex... |
1766 |
EXPORT_SYMBOL(remap_pfn_range); |
1da177e4c Linux-2.6.12-rc2 |
1767 |
|
f905bc447 nommu: add new vm... |
1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 |
int remap_vmalloc_range(struct vm_area_struct *vma, void *addr, unsigned long pgoff) { unsigned int size = vma->vm_end - vma->vm_start; if (!(vma->vm_flags & VM_USERMAP)) return -EINVAL; vma->vm_start = (unsigned long)(addr + (pgoff << PAGE_SHIFT)); vma->vm_end = vma->vm_start + size; return 0; } EXPORT_SYMBOL(remap_vmalloc_range); |
1da177e4c Linux-2.6.12-rc2 |
1782 1783 1784 1785 1786 |
unsigned long arch_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { return -ENOMEM; } |
1363c3cd8 [PATCH] Avoiding ... |
1787 |
void arch_unmap_area(struct mm_struct *mm, unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1788 1789 |
{ } |
1da177e4c Linux-2.6.12-rc2 |
1790 1791 1792 1793 1794 |
void unmap_mapping_range(struct address_space *mapping, loff_t const holebegin, loff_t const holelen, int even_cows) { } |
22c4af409 [PATCH] nommu: ex... |
1795 |
EXPORT_SYMBOL(unmap_mapping_range); |
1da177e4c Linux-2.6.12-rc2 |
1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 |
/* * Check that a process has enough memory to allocate a new virtual * mapping. 0 means there is enough memory for the allocation to * succeed and -ENOMEM implies there is not. * * We currently support three overcommit policies, which are set via the * vm.overcommit_memory sysctl. See Documentation/vm/overcommit-accounting * * Strict overcommit modes added 2002 Feb 26 by Alan Cox. * Additional code 2002 Jul 20 by Robert Love. * * cap_sys_admin is 1 if the process has admin privileges, 0 otherwise. * * Note this is a helper function intended to be used by LSMs which * wish to use this logic. */ |
34b4e4aa3 fix NULL pointer ... |
1813 |
int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin) |
1da177e4c Linux-2.6.12-rc2 |
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 |
{ unsigned long free, allowed; vm_acct_memory(pages); /* * Sometimes we want to use more memory than we have */ if (sysctl_overcommit_memory == OVERCOMMIT_ALWAYS) return 0; if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) { |
c15bef309 mmap: fix and tid... |
1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 |
free = global_page_state(NR_FREE_PAGES); free += global_page_state(NR_FILE_PAGES); /* * shmem pages shouldn't be counted as free in this * case, they can't be purged, only swapped out, and * that won't affect the overall amount of available * memory in the system. */ free -= global_page_state(NR_SHMEM); |
1da177e4c Linux-2.6.12-rc2 |
1836 |
|
1da177e4c Linux-2.6.12-rc2 |
1837 1838 1839 1840 1841 1842 1843 1844 |
free += nr_swap_pages; /* * Any slabs which are created with the * SLAB_RECLAIM_ACCOUNT flag claim to have contents * which are reclaimable, under pressure. The dentry * cache and most inode caches should fall into this */ |
972d1a7b1 [PATCH] ZVC: Supp... |
1845 |
free += global_page_state(NR_SLAB_RECLAIMABLE); |
1da177e4c Linux-2.6.12-rc2 |
1846 1847 |
/* |
d5ddc79bc [PATCH] overcommi... |
1848 1849 |
* Leave reserved pages. The pages are not for anonymous pages. */ |
c15bef309 mmap: fix and tid... |
1850 |
if (free <= totalreserve_pages) |
d5ddc79bc [PATCH] overcommi... |
1851 1852 |
goto error; else |
c15bef309 mmap: fix and tid... |
1853 |
free -= totalreserve_pages; |
d5ddc79bc [PATCH] overcommi... |
1854 1855 1856 1857 |
/* * Leave the last 3% for root */ |
1da177e4c Linux-2.6.12-rc2 |
1858 |
if (!cap_sys_admin) |
c15bef309 mmap: fix and tid... |
1859 |
free -= free / 32; |
1da177e4c Linux-2.6.12-rc2 |
1860 1861 1862 |
if (free > pages) return 0; |
d5ddc79bc [PATCH] overcommi... |
1863 1864 |
goto error; |
1da177e4c Linux-2.6.12-rc2 |
1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 |
} allowed = totalram_pages * sysctl_overcommit_ratio / 100; /* * Leave the last 3% for root */ if (!cap_sys_admin) allowed -= allowed / 32; allowed += total_swap_pages; /* Don't let a single process grow too big: leave 3% of the size of this process for other processes */ |
731572d39 nfsd: fix vm over... |
1877 1878 |
if (mm) allowed -= mm->total_vm / 32; |
1da177e4c Linux-2.6.12-rc2 |
1879 |
|
00a62ce91 mm: fix Committed... |
1880 |
if (percpu_counter_read_positive(&vm_committed_as) < allowed) |
1da177e4c Linux-2.6.12-rc2 |
1881 |
return 0; |
00a62ce91 mm: fix Committed... |
1882 |
|
d5ddc79bc [PATCH] overcommi... |
1883 |
error: |
1da177e4c Linux-2.6.12-rc2 |
1884 1885 1886 1887 |
vm_unacct_memory(pages); return -ENOMEM; } |
cae5d3903 mm: arch: rename ... |
1888 |
int in_gate_area_no_mm(unsigned long addr) |
1da177e4c Linux-2.6.12-rc2 |
1889 1890 1891 |
{ return 0; } |
b0e15190e [PATCH] NOMMU: Ma... |
1892 |
|
d0217ac04 mm: fault feedbac... |
1893 |
int filemap_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
b0e15190e [PATCH] NOMMU: Ma... |
1894 1895 |
{ BUG(); |
d0217ac04 mm: fault feedbac... |
1896 |
return 0; |
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1897 |
} |
b50731732 nommu: vmalloc_32... |
1898 |
EXPORT_SYMBOL(filemap_fault); |
0ec76a110 [PATCH] NOMMU: Ch... |
1899 |
|
f55f199b7 NOMMU: implement ... |
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static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) |
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1902 |
{ |
0ec76a110 [PATCH] NOMMU: Ch... |
1903 |
struct vm_area_struct *vma; |
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down_read(&mm->mmap_sem); /* the access must start within one of the target process's mappings */ |
0159b141d [PATCH] NOMMU: Us... |
1908 1909 |
vma = find_vma(mm, addr); if (vma) { |
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/* don't overrun this mapping */ if (addr + len >= vma->vm_end) len = vma->vm_end - addr; /* only read or write mappings where it is permitted */ |
d00c7b993 [PATCH] NOMMU: Pe... |
1915 |
if (write && vma->vm_flags & VM_MAYWRITE) |
7959722b9 NOMMU: Use copy_*... |
1916 1917 |
copy_to_user_page(vma, NULL, addr, (void *) addr, buf, len); |
d00c7b993 [PATCH] NOMMU: Pe... |
1918 |
else if (!write && vma->vm_flags & VM_MAYREAD) |
7959722b9 NOMMU: Use copy_*... |
1919 1920 |
copy_from_user_page(vma, NULL, addr, buf, (void *) addr, len); |
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else len = 0; } else { len = 0; } up_read(&mm->mmap_sem); |
f55f199b7 NOMMU: implement ... |
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return len; } /** * @access_remote_vm - access another process' address space * @mm: the mm_struct of the target address space * @addr: start address to access * @buf: source or destination buffer * @len: number of bytes to transfer * @write: whether the access is a write * * The caller must hold a reference on @mm. */ int access_remote_vm(struct mm_struct *mm, unsigned long addr, void *buf, int len, int write) { return __access_remote_vm(NULL, mm, addr, buf, len, write); } /* * Access another process' address space. * - source/target buffer must be kernel space */ int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write) { struct mm_struct *mm; if (addr + len < addr) return 0; mm = get_task_mm(tsk); if (!mm) return 0; len = __access_remote_vm(tsk, mm, addr, buf, len, write); |
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1964 1965 1966 |
mmput(mm); return len; } |
7e6608724 nommu: fix shared... |
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/** * nommu_shrink_inode_mappings - Shrink the shared mappings on an inode * @inode: The inode to check * @size: The current filesize of the inode * @newsize: The proposed filesize of the inode * * Check the shared mappings on an inode on behalf of a shrinking truncate to * make sure that that any outstanding VMAs aren't broken and then shrink the * vm_regions that extend that beyond so that do_mmap_pgoff() doesn't * automatically grant mappings that are too large. */ int nommu_shrink_inode_mappings(struct inode *inode, size_t size, size_t newsize) { struct vm_area_struct *vma; struct prio_tree_iter iter; struct vm_region *region; pgoff_t low, high; size_t r_size, r_top; low = newsize >> PAGE_SHIFT; high = (size + PAGE_SIZE - 1) >> PAGE_SHIFT; down_write(&nommu_region_sem); /* search for VMAs that fall within the dead zone */ vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap, low, high) { /* found one - only interested if it's shared out of the page * cache */ if (vma->vm_flags & VM_SHARED) { up_write(&nommu_region_sem); return -ETXTBSY; /* not quite true, but near enough */ } } /* reduce any regions that overlap the dead zone - if in existence, * these will be pointed to by VMAs that don't overlap the dead zone * * we don't check for any regions that start beyond the EOF as there * shouldn't be any */ vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap, 0, ULONG_MAX) { if (!(vma->vm_flags & VM_SHARED)) continue; region = vma->vm_region; r_size = region->vm_top - region->vm_start; r_top = (region->vm_pgoff << PAGE_SHIFT) + r_size; if (r_top > newsize) { region->vm_top -= r_top - newsize; if (region->vm_end > region->vm_top) region->vm_end = region->vm_top; } } up_write(&nommu_region_sem); return 0; } |